diff --git a/library/ecp_curves_new.c b/library/ecp_curves_new.c
new file mode 100644
index 0000000000..e80088e961
--- /dev/null
+++ b/library/ecp_curves_new.c
@@ -0,0 +1,9 @@
+/*
+ *  This file used to be non-empty. It's kept only for compatibility
+ *  with custom build systems in LTS branches.
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+typedef int iso_c_forbids_an_empty_translation_unit;